Here's a quick and dirty starting point.
Start with the Classic Vibe model in the Phase block.
Reduce the Mix to 50% for a bit less pitch warble
One the More page of the Phaser block, try these to even out the sweep:
Type: Photocell
Bias: 0.25
Exponent: 1.0
Attack: 10ms
Release 10ms
From there, assign a pedal to the rate parameter with Min around 1 Hz and Max around 6 Hz or so.
To my ears it tends to sound the best with the depth turned down a bit at higher settings, so one way to do that is to assign the same pedal to the depth parameter as well. Set Min to around 5 and Max to 10 and then Swap the Start and End values to 100% and 0% respectively. That will make the depth go down as the rate goes up and you end up with a bit more even sounding rate range.
Sounds decently close into a cranked JCM800 style amp.
